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Elucidating raw material variability--importance of surface properties and functionality in pharmaceutical powders
Sai P Chamarthy1, Rodolfo Pinal, M Teresa Carvajal
1Department of Industrial and Physical Pharmacy, Purdue University, West Lafayette, Indiana 47907, USA.
AAPS Pharmscitech
|June 6, 2009
Summary
Raw material variability significantly impacts pharmaceutical excipient functionality. Even identical physical test results can mask critical differences in compaction properties due to altered surface energy after processing.
Area of Science:
- Pharmaceutical Science
- Materials Science
- Chemical Engineering
Background:
- Pharmaceutical excipients require consistent functionality for drug product manufacturing.
- Raw material variability, even subtle, can affect processing outcomes.
- Standard physical characterization may not fully predict functional performance.
Purpose of the Study:
- To demonstrate how raw material variability influences excipient functionality during processing.
- To investigate the impact of a modified purification step on soluble starch compaction properties.
- To correlate physical characteristics with functional performance in pharmaceutical excipients.
Main Methods:
- Dividing a commercial soluble starch lot into two groups: one intact, one with an additional washing step.
- Conducting standard physical characterization tests on both starch lots.
- Evaluating the compaction properties of both lots under various conditions.
- Analyzing surface energetic properties of the powders.
Main Results:
- Both starch lots exhibited nearly identical results in standard physical characterization tests.
- Despite similar physical properties, the two lots showed significantly different compaction behaviors.
- The washed starch lot consistently produced stronger compacts.
- The additional washing step measurably increased the surface energy of the soluble starch.
Conclusions:
- Standard physical tests are insufficient to predict functional performance of excipients.
- Variability in raw material processing, like washing, can alter surface properties and impact functionality.
- Surface energy is a critical factor influencing the compaction behavior of pharmaceutical powders.
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